No. 20526. Argued April 14, 1967. Decided June 15, 1967. Petition for Rehearing Denied August 17, 1967. Mr. John Silard, Washington, D.C., with whom Mr. Joseph L. Rauh, Jr., Washington, D.C., was on the brief, for petitioner. Mrs. Nancy M. Sherman, Atty., N.L.R.B., with whom Messrs. Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, and Marcel Mallet-Prevost, Asst. Gen. Counsel, were on the brief, for respondent. Mr. George J. Tichy, Spokane, Wash., was on the brief for intervenor